Modify mesh in a particular Viewport

Hi 

I am trying to develop very basic 2D car game. In the game I want to show a small map on top right side of the screen which is actually same track but with a zoomed out scene so that user can see what is coming ahead of the car. I was able to accomplish this but now my problem is in the zoomed out map car is very small mesh.

Is there any view where I can change size of a particular mesh(Car) and then create a view port

or can I change size of mesh(Car) in just one viewport. I am attaching screenshot of scenario and code by which I have implemented my existing code 

var camera1 = new BABYLON.FreeCamera("camera1",  new BABYLON.Vector3(0, 0, -8), scene);
camera.viewport = new BABYLON.Viewport(0, 0, 1, 1);
var camera2 = new BABYLON.FreeCamera("camera2",  new BABYLON.Vector3(0, 0, -50), scene);
camera2.viewport = new BABYLON.Viewport(0.8, 0.8, 0.2, 0.2);
scene.activeCameras.push(camera1);
scene.activeCameras.push(camera2);

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